Green-sand core.



T. DE LA HUNTY.

GREEN SAND- GOBE. I grrmouron' run!) In. 7, 1910.

Patented Nov. 22, 1910.

Q0DO,OO 0000000 OOOQOOOO wooocooo lNVENTOE WITNESSES cie Z4 @W'% ff/ sfrA'rEs PATENT OFFICE.

THOMAS DE LA, HUNTY, on ST. Louis, missoiini, assien'on To SCULLIELGALLAGHER- men & STEEL COMPANY, or ST. Louis, MISSOURI, A oonroaa'rion or nissonni.

onnnnsann come.

To all whom it may concern:

Be it knowrrthat L Ti-IoMAs on LA Hunt-Y,

a citizen of the United States, residing at St. Louis, Missourh have invented a certain newand useful Improvement in Greeirsand Cores, of which the followingis a full, clear, and exact description.- such as will enable others skilled in theart to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification in whicl Figure 1 is an elevation of'a simple apparatus utilized vfor producing green sand cores and showing the forming-box," pattern and backing-plate in section; Fig. 2 is a plan viewpf the apparatus; Fig. 3 is a detail section of a portion of a flask showing one of the reenflsand cores in position therein; Fig. 4 1s a detail view of one corner of the backing-plate to which the green sand is keyed. 5 is a sectional view of a modificatlon. v

My invention relates generally to cores particularly adapted fornse in flasks and mold-boxes, and the particular object of my invention is to form a core of green sand which can be used as an inside" or outside core, as well as a matrix wall, said.core'bing so formed as'that it will readily withstand the rough usage to which cores are ordinarily subjected during the formation of the flask or mold-box.

A further object of my invention is to provide means whereby green sand is keyed to a backing-plate in order that. a very substantialicore may be formed and immediately utilized for any part .of the flask thereby eliminating'the. time, labor, and conseuent expense involved in the present practice of baking and hardening cores.

To the above purposes, my invention'consists in the features of novelty hereinafter more fully described and claimed.

Referring by numerals to the accompanying drawings, 1 indicates the forining box, which is preferably constructed of four Walls the ends of which are hinged to one another at three corners and the remaining corner being provided with a suitable fastening device, thus enabling the box to be readily opened after the green sand has been keyed to the backing-plate to form the core. The backing-plate 2 is preferably 'a solid metal plate, and projecting-from one face thereof is a series of pins or fingers 3, the

v Specification of Letters Patent;

Application filed January '7, 1910.

' Patented Nov.

Serial N0.,53.858.

outer ends of which :are enlarged to form heads a which materially assist in keying the green sand to the plate.

Y 5 designates a plate carried by the piston or plunger of a press or squeezing.n'iachine, and which plate carries a pattern 6 which is utilized for forming the niatriiv in the green sand core.

7 designates the frame of the press or squeezingmachine the upper portion of which is provided with cross pieces 8 against which the backing-plate 2 engages whenthe pressing or squeezing operation takes place.

lVhile I prefer to form the backing-plate of metal said plate can be formed of wood or like material in which nails, screws. or pins are seated, as shown in'Fig. here the backing-plate is formed of metal the pins or fingers are preferably formed intogral. therewith and tliesurfaces of said pins or fingers can be roughened or corrugated, as desired, and the heads of the pins may vary in size and contour. In the formation of my improved core, the pattern is positioned on the plate 5, after which the box l is positioned on said. plate around the pattern, and said box is now filled with-greensand. The backing plate is now positioned upon the sand within the box 1 and the press or squeezing ma chine is now operated to elevate the plate 5, and as a result the backing-plate 2' is forced intothe upper'portion of the box 1, and the donning-box 1 is removed from the core and the plate 2 carrying the; green sand core is now lifted from the plate 5 and pattern 6 and is ready to be positioned in the fiask. or mold-box. The 'sandis very tightly packed in and around the pins carried by the back ing-pla'te, and therefore a very substantial core is provided, which core can be readily handled and transported from the point where it is formed to the point where the flask or inold-bovis'locatedn I In the formation of green sand cores, as

contemplated by .my invention, the. time and labor ordinarily involved in baking or hardening cores is entirely done away with, and therefore the flask can be formed in much less time. and with less 'ei ipense than by the methods heretofore practiced. While iny improved cores are particularly adapted for matrix Walls and flask covers, it Will-be readily understood that inside and outside cores can be formed in the manner hereindescribed.

In Fig. 5 I have shown Iny invention be ing utilized in connection with a core in which thereis a wooden arbor 2 on each sideof which are the anchor pins or projections 3. Green sand is pressed on each side of the arbor at the same time, and the core thus formed being arrangedin the hole cav ity in the usual way. \Vhen the molten metal is poured in the cavity and around the core, the wooden arbor willbedestroyed or consumed, theheat of the metal penetrating through the sand. In. this way, the pins drop out and can be knocked out with the sand.

I claim: 1. The COIIlblIlLtlOIl of'a green sand core and a destruotible arbor embedded therein,

. 2. The combination of a green sand core,

a destruotible arbor embedded there'inf'and anchoring rneans arranged on the opposite supporting said green sand.

In testimony whereof I'hereunto aflix my signature in the resenoeof two Witnesses, this 29th day of member-1909.

THOMAS DE LA'IHUNTY.

Witnesses M. P. SMITH, v

ALMA GEBHART. 

